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Old 1st March 2013, 08:12 PM   #1591
Salas is offline Salas  Greece
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Their datasheet 200MHz Ft was difficult to verify by simpler means than Agilent specialized lab array of instruments but they should be at least 2 times faster than the MJEs. I am familiar with the core topology also and I will give them a try. I will check oscillation chance easily too, no worries.
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Old 2nd March 2013, 09:15 AM   #1592
RCruz is offline RCruz  Switzerland
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I am slightly confused.... I used D44H11 D45H11 with great success
I know I could use TIP31C TIP32C instead...
Now You talk about MJE15030/MJE15031 and now 2SA1930/2SC5171

Are all these pin compatible and possible replacements ?
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Old 2nd March 2013, 09:57 AM   #1593
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by RCruz View Post
I am slightly confused.... I used D44H11 D45H11 with great success
I know I could use TIP31C TIP32C instead...
Now You talk about MJE15030/MJE15031 and now 2SA1930/2SC5171

Are all these pin compatible and possible replacements ?
They are all compatible (in this application). With no change, the D44H11/D45H11 pair is still my favorite.

The MJE's I have seen oscillate, even though the lower Hfe (you need to know that the mentioned Hfe's and Ft's are a kind of 'ballpark' figure at the 150 mA application). The TIP's I do not know, but there Ft of 3Mhz is below the 5Mhz design goal for the PSU.

And now we have the 2SA/SC's, if high Ft helps, to prevent oscillations, then they may change my mind (and I may make them my favorite). The main difference will (I do think) (in relation to oscillating) be Cob (not Ft), for the D44/D45 this figure is 90/160 pF and for the 2SA/SC it is 26/16 pF (but it may be that the lower Cob enables the device to oscillate at even higher frequencies).

D44H11/D45H11
, , Ft 40Mhz Hfe 100
, , http://www.mouser.com/ds/2/308/D44H-D-111810.pdf
TIP31/32
, , Ft 3Mhz Hfe 20
, , http://www.mouser.com/ds/2/308/TIP31A-D-116282.pdf
MJE15030/MJE15031
, , Ft 30Mhz Hfe 40
, , http://www.mouser.com/ds/2/308/MJE15028-D-110804.pdf
2SA1930/2SC5171
, , Ft 200Mhz Hfe 100
, , http://www.mouser.com/ds/2/408/7654-58852.pdf
, , http://www.mouser.com/ds/2/408/7870-24209.pdf

P.s. In an earlier comment I said that I thought that the 2SA/SC has a low 100 mA Hfe of 40, I have to take that back (wrong information source at that time) the 'official' Toshiba datasheet gives a figure of 100.

Last edited by FdW; 2nd March 2013 at 10:11 AM.
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Old 2nd March 2013, 03:07 PM   #1594
RCruz is offline RCruz  Switzerland
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Quote:
Originally Posted by FdW View Post
The The main difference will (I do think) (in relation to oscillating) be Cob (not Ft), for the D44/D45 this figure is 90/160 pF and for the 2SA/SC it is 26/16 pF (but it may be that the lower Cob enables the device to oscillate at even higher frequencies).
Thank you
So are you inclined to believe higher Cob might be better ?
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Old 2nd March 2013, 03:51 PM   #1595
FdW is offline FdW  Netherlands
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Originally Posted by RCruz View Post
Thank you
So are you inclined to believe higher Cob might be better ?
No, I do not but in this (and exactly this) situations, it may be that a higher Cob is more preventative towards oscillation, and then again, it may be the other way around. That is why I am happy to someone using high Ft low Cob transistors in the PSU (as I told Salas (at the least tried to tell (o.k. now I am over-explaining things (I got to stop (now ))))). My initial guestimate was, use medium Ft medium Cob transistors, given the fact that this would not lead (ever) to oscillation into the 100's of MHz's, that would be bad, most people would not be able to spot those. As you can see (I hope) a lot of thought goes into these things, and still one is not able to mate the 'perfect' choice

P.s. Please make next a long question, for a short and easy answer
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Old 2nd March 2013, 04:33 PM   #1596
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Sorry what is Cob? you lost me....

I don't know if I have any of those 100 Megamagic things in my R2
It sound pretty good to me still. ? would Wirevound 120Homs resistor make it? worst better no change (please tic as applicable)

Another thing I have slowly been getting same Diotec BCXXX40 so far those have much tighter Hfe match than any maybe be worth ordering those for next GB
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Old 2nd March 2013, 04:42 PM   #1597
Salas is offline Salas  Greece
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Cob is the intrinsic output capacitance of a BJT. Its related to its transition frequency (Ft in MHz) capability also. Some circuits need "fast" BJTs other are better off with "slow".
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Old 2nd March 2013, 04:44 PM   #1598
Salas is offline Salas  Greece
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P.S. You guys did you specify the local terminating 10uF lytics ESR by any chance? That can be a variant between types to give instability if its not indifferent by design.
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Old 2nd March 2013, 05:34 PM   #1599
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by Salas View Post
P.S. You guys did you specify the local terminating 10uF lytics ESR by any chance? That can be a variant between types to give instability if its not indifferent by design.
It was defined as a 'High ESR' or otherwise 'Low cost' capacitor. This was a mistake, next time I would specify a (greater than) 500mOhm ESR or series resistance (this is more specific ). See also PradiseBuilders #1403 Capacitors bad vs good.

These are the most important/relevant messages regarding PSU and Pre-Reg.
  1. Mpp #4375 PSU-pre-regulator.
  2. Mpp #4610 V2 Schemas UPS and Amp.
  3. Mpp #6506 CCS fine-tuning.
  4. Mpp #6462 PSU with my notes.
  5. Mpp #6809 Do not try to feed the CVS of the CCS of the shunt with a regulated power supply.
  6. Mpp #7127 More about transformer selection.
  7. Mpp #7635 Single and dual transformer wiring (also corrected drawing) (See also #7733).
  8. Mpp #7733 Grounding (PSU, RIAA and Player).
  9. Mpp #7810 35V PSU for the CroMagnon.
  10. Mpp #7830 The PSU explained.
  11. Mpp #8386 My resistor recommendation’s.
  12. PradiseBuilders #13 Schema's and assembly guide.
  13. PradiseBuilders #155 Vdc input voltage minimum simulated.
  14. PradiseBuilders #970 PSU oscillates; posible solutions?
  15. PradiseBuilders #983 Compensating the PSU for oscillations.
  16. PradiseBuilders #1173 Fixing oscillations (up to #1182).
  17. PradiseBuilders #1322 Fuse .
  18. PradiseBuilders #1387 Updated Paradise R3 assembly guide (Also German).
  19. PradiseBuilders #1403 Capacitors bad vs good.
Have a look at these and their following messages.
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Old 2nd March 2013, 06:37 PM   #1600
Salas is offline Salas  Greece
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Thanks will give a look.
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